Having completed Capstone I and II, the requirements and test plan documents are the most important documentation you have for your product. These documents describe the product’s mechanical properties, electrical properties, biocompatibility and the likes. These documents are also considered living documents because if there are any additions to the product, the person adding a new feature will look at these documents and add the necessary additions accordingly. It is important that these documents describe each feature as concise as possible to ensure that the product does what its intended to do based on customer needs.